Question 6 (5 marks) A DC motor of square coil ABCD with sides 10.0 ch consists of 100 turns. It is rotated in the field of a
uniform permanent magnet of field strength 20 mT, as shown in Figure 5. The current in the square coil
is 500 mA.
Figure 5
In the position shown, what is the magnitude of the net force on the arms AB?
2 marks

Less force and energy was applied

Jenny and fred both play a long note on their trombones. a stationary observer hears the sound increasing and decreasing repeatedly in loudness. which of these must be true? the sound waves from the two trombones have slightly different frequencies.the sound waves from the two trombones have the same frequency.the sound waves from the two trombones have slightly different amplitudes.the sound waves from the two trombones have the same wavelength.the sound waves from the two trombones have slightly different velocities.  lolthe answer is          the sound waves from the two trombones have slightly different frequencies.